source:Industry News Popular:adapter release time:2022-04-20 11:25:59 Article author:yu
With the advancement of intelligent life, the research and development speed of new products of switching power adapters is also accelerating. Among them, high-frequency switching power adapters have emerged, and their proportion in the domestic market is increasing. So, what are the advantages of high frequency adapters? This article will summarize for you one by one, and take a look at the unique advantages of high-frequency adapters.
As we all know, in a high-frequency switching power supply circuit, the switch tube alternately works in the on-off and off-on switching states under the excitation of the excitation signal. The switching speed of the switching tube is very fast, and its frequency is generally about 50kHz. In some technologically advanced countries, it can even reach hundreds or even nearly 1000kHz, which makes the power consumption of the switching tube very small, and the efficiency of the switching power supply can be greatly improved. The efficiency can reach more than 80%.
Compared with traditional adapters, high-frequency switching power adapters also have the new advantages of small size and light weight. Because the bulky power frequency transformer is not used in the high-frequency switching power supply circuit, and the dissipated power on the switching tube is greatly reduced, the larger heat sink is omitted. Based on these two reasons, the high-frequency switching power supply achieves the purpose of small size and light weight.
The third advantage of a high-frequency power adapter is that it has a wide voltage regulation range, and the voltage regulation method referenced by the designer has no limitations. The output voltage of the high-frequency switching power supply is regulated by the excitation signal, and the change of the input signal voltage can be compensated by frequency modulation or width modulation, so that when the power frequency grid voltage changes greatly, it can still ensure a relatively stable voltage. The output voltage. Therefore, the voltage regulation range of the high frequency switching power supply is very wide, and the voltage regulation effect is very good. In addition, there are two ways to change the duty cycle of the switch tube: pulse width modulation and frequency modulation. In this way, the high-frequency switching power supply not only has the advantages of a wide range of voltage regulation, but also has many methods to achieve voltage regulation. Designers can flexibly select various types of high-frequency switching power supplies according to the requirements of practical applications.
The fourth advantage of the high-frequency switching power supply is that its filtering efficiency is greatly improved, and due to the increase in the switching frequency of the high-frequency switching power supply, the capacity and volume of the filter capacitor are also greatly reduced. The operating frequency of the high-frequency switching power supply is basically 50kHz at present, which is 1000 times that of the linear regulated power supply, which makes the filtering efficiency after rectification almost 1000 times higher. Even with half-wave rectification followed by capacitor filtering, the efficiency is increased by 500 times.
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